Abstract
In this paper, a novel process welding for composite pipe, firstly overlaid by SMAW in composite pipe end and subsequently butted by TIG, can greatly improve the joints' comprehensive properties. Mechanical, corrosion tests and microstructure observation were carried out on welded joints. The results show that base X65 is composed of pearlite and ferrite and the weld is composed of dendritic austenite. The microstructure of HAZ in X65 has an upper bainite with coarse grains. The overlaying layer contains single-phase dendritic austenite, which has an apparent phenomenon of competitive growth similar to the weld, with solid subgrain boundary, solidified grain boundary and migrated grain boundary. By comparing the conventional welding process with the novel welding process, the welded joint shows better properties in mechanics and corrosion, showing the advantages in composite pipe.
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